Grinding-machine.



L. E. JOHNSON & S. STROM.

GRINDING MACHINE.

APPLICATIGN FILED MAR. 2. I915.

1,156,292, Patented Oct. 12, 1915.

, 2 SHEETS$HEET 1- if Ii L. E. JOHNSON & S. STROM.

GRINDING MACHINE.

APPLICATION FILED MAR. 2.1915.

1,156,292. Patented 00 12, 1915.

2 SHEETS-SHEET 2.

. 5 mwz'efozmwm ZN 252 10:722,

LOUIS E. JOHNSON.AND SAMUEL STROM, OF LOS ANGELES, CALIFORNIA.

GRINDING-MACHINE.

Specification of Letters Patent.

' Patented0ct.12,1 915.

Application filed March 2, 1915. Serial No. 11,556.

To all whom it may concern:

Be it known that we, Loms E. JOHNSON, a citizen of the United States, and SAMUEL STROM, a subject of the King of Sweden, both residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Improvement in Grinding-Machines, of which the following is a specification.

Our invention relates to grinding machines, and particularly to grinding machines having a spindle rotating in fixed bearings, this spindle carrying the grinding wheel which operates on work carrled by a movable table, this table being so arranged that it can be raised or lowered, and having longitudinal and cross feeds as is usual in such machines.

The first object of our invention is to provide an attachment which may be mounted on such a table by which internal and external ball races may be ground on various j and 4 showing the machine grinding an insizes of ball race rings. This attachment is so built that it can be readily attached to or removed from the grinding machine without alteration of that machine.

A second object of our invention is to provide means whereby the radius of such ball races may be adjusted accurately.

A third object of our invention is to provide means'whereby various sizes of grinding wheels may be used and the machine adjusted accurately to each.

Further objects and advantages will be evident to one skilled in the grinding art after an inspection of the annexed drawings and a perusal of the following specification.

In the drawings, which illustrate one convenient embodiment of our invention: Figure 1 is a plan view of the grinding machine with the attachment mounted thereon, the chuck and work being shown partially in section to better illustrate the invention. Fig. 2 is an elevation, partially in section, on the plane w -m of Fig. 1. Fig. 3 is a plan with the work spindle slued around, a portion of the structure being shown in section to better illustrate the invention. Fig. 4 is an end elevation of the'machine and attachment shown in Figs. 1, 2 and 3. Fig. 5 is a partial plan of the same machine grinding an external ball race, Figs. 1, 2,3

ternal ball race.

Our invention consists broadly of a grindmg spindle 11 mounted in a fixed bearing 12 dr ven through a pulley 13 and having a grlndlng wheel 14 mounted thereon. A work splndle 15 is mounted in a bearin 16 and drlven through a pulley, 17. In grlnding internal ball races as illustrated in Figs. 1, 2, 3 and 4, a chuck 18 is secured to the spindle 15, and thework 19 is secured there-' 1n by means of a ring 20 and screws 21.

The bearings 12 are formed on a standard 22 which rests upon a bracket 23, being secured thereto by suitable bolts.

lVIach1nes having a vertical adjustment on thls bracket may be used by locking this adustment in place, any vertical movement of the bracket 23 being unnecessary in this applicatlon. Slidably mounted in the bracket 23 1s a cross slide24, this slide being fed in the directions of the arrows 25 shown in Flg. 2 by means of a longitudinal location screw 26 having a longitudinal location handle 27. A work table 28 is slidably mounted in the slide 24, the slide 24 having a rack 29 formed thereon which is engaged by a gear 30 turned by a shaft 31 and a cross feed handle 32. The table 28, the slide 24, and the means ofadjusting them with rela tion to the bracket 23, are a part of the grlnding machine proper, and other forms of adjustment may be substituted therefor without changing the essentials of our inventlon.

The table 28 has a series of slots 33, 34

' and 35 formed therein by means of. which work is ordinarily secured to the table. A base plate 36 is secured to the table 28 by means of bolts 37 which engage the slots 34 and 35 and clamp the base plate 36 firmly to the table 28 so that they operate as a unit. By removing the bolts 37 the attachment may be taken 011' and the grinder used for other sorts of work. 7

An opening 38 is cut in the base plate 36, and-a ball bearing 39 consisting of an inner ring 40 and-outer ring 41 and a series of balls 42 is placed therein, the outer ring 41 bearing on the top of the opening and the inner ring 40 being engaged by a head 43 plate 45, holding them firmly together in such a manner that the pivoted plate can swing treelyaround the pin 44.

, Slidablyxmounted in guldes formed in the pivoted plate 45 is an attachment sllde 51, this slide being moved in the directions of the arrows 52 shown in Fig. 2 by an attachment slide screw 53 rotatable in and axially secured in a bearing 54 formed on the slide 1, the screw 53 being turned by an attachment slide handle 55 and belng threaded to engage a nut 56 formed on the pivoted plate 45.

A. head 57 is mounted in guides 58 so that it moves at right angles to the arrows 52 of Fig. 2, being actuated by a cross feed screw 5,9 rotatable in and axially secured in a bearing 60 formed on the slide 51 and threaded in the head 57, the screw 59 being turned by a cross feed handle 61. A handle 62 is formed on the attachment slide 51 at any convenient point. 7 r

en it is desired to turn external ball races as shown 'in Fig. 5, the work 101 is secured by a nut 102 directly on the work spindle 15.

The method of operation when grinding internal ball races as shown in Figs. 1, 2, 3 and 4 is as follows :The attachment is se cured to the grinder by bolting the base plate 36 to the table 28 by means of the bolts 37 Tn machines having an adjustable bracket 23, this bracket is adjusted until the spindle 15 and the spindle 11 are in the same tthoriz'ontal plane. In the machine illustrated, the bracket 23 is fixed at the proper height toaccomplish this. Any suitable diameter and thickness of grinding wheel 14 is then attached to the grinding spindle 11. The exact dimensions of the wheel 14 are of no importance and the wheel may be dressed or a new wheel substituted if desired, the machine being adjusted to suit the work and the wheel. The work 19 is then secured in the chuck by means of the plate 20, this chuck having a series of steps of difierent diameters to take difierent diameters of work. The screw 26 is then turned by the handle 27 until the axis of the pivot pin 44 is in the plane of the wheel 14 and the screw 53 is turned by the handle 55 until the center of the raceway in the work 19 is in the same plane, the wheel 14 being inside the work 19, but not touching same. The screw 59 is then turned by the handle 61 until the vertical axis of the pin 44 passes through the center of the raceway in the work 19 on a .diametral horizontal plane, so that the work can be swung around that axis; The table 28 and the parts secured to the top thereof are then moved by a suitable manipulation of the hand wheel 32, so that the work 19 is thrown against the wheel 14, the am's of the pin 44 passing .through the central plane of the wheel at a distance from the cutting edge of the wheel exactly equal to the radius to be ground, so that the 1 fro, the edges of the grinding wheel 14 cutting the ball groove in the work at an exact radius. The operation when grinding external races is exactly similar.

We claim as our invention 1. A grinding machine comprising a sup porting structure, a standard rigidly secured to said structure, a grinding spindle journaled in bearings in said standard, a grinding wheel mounted on said grinding spindle, a. work spindle, a chuck mounted on saidwork spindle, a head in which said work spindle is journaled, an attachment slide in which said head is slidably mounted, means for moving said head in said slide, a pivoted plate in which said attachment-slide is slidably mounted, means for moving said slide in said plate, a base plate to which said pivoted plate is pivoted, means by which said pivoted plate may be rotated on said base plate, a work table to which said base such a height as to place the work spindle and the grinding spindle in the same horizontal plane, means for slidably securing the cross slide in said bracket, and means for moving said slide in said bracket.

2. A grinding machine comprising a supporting structure, a standard formed intogrally with said structure, grinding spindle bearings secured in said standard, a grinding spindle turning in said bearings, a grinding wheel securedon a projecting end of said grinding spindle, a work spindle,- a chuck secured on said work spindle in which the work to be mounted is secured, a head in 1 which said grinding spindle turns, an at-- tachment slide, means for securing said head in said slide so that the head is restrained to move in a straight line transversely of the work spindle, means for adjusting the position of said head on said slide, a pivoted plate, means for securing said attachment slide in said pivoted plate so that the attachment slide is restrained to move in a straight line parallel to the axis of the work spindle, means for adjustingthe position of the attachment slide onthe pivoted plate, a base plate, means for pivoting the pivoted plate on said base plate, a work table, means for securing the base plate to the work table, a cross slide, means for securing the work table in said cross slide so that the work table is restrained to move in a straight line at right angles to the grinding spindle, means for ad ustlng the position of the work table in sand cross slide, a bracket secured to said curing the cross slide in the bracket so that the cross slide is restrained to move 1n a straight line parallel to the grindingspindle, and means for adjusting the position 0 said cross slide in said bracket.

' 3. An attachment for grinding machines having a fixed grinding spindle and a work table adjustable in the direction of the axis of the grinding. spindle and independently adjustable in a direction at right angles to the. axis of the grinding table, said attachment comprising a work spindle, a chuck mounted on said Work spindle, a head in which said work spindle is journaled, an attachment slide in which said head is slidin said slide, a pivoted plate in which said attachment slide is slidably mountttl, means for moving said slide in saidplate, a base plate to which said pivoted plate is pivoted, means by which said pivoted plate may be rotated on said base plate, and means for securing said base plate to the work table of the grinding machine.

In testimony whereof, we have hereunto set our hands at Los Angeles, California, this 24th day of February, 1915.

LOUIS E. JOHNSON. SAMUEL STROM.

In presence of- FRED A. MANsFIELn, FORD W. HARRIS. I 

